Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a82cdbf270393aa…

MALICIOUS

PDF

83.3 KB Created: 2021-09-24 11:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b997aea9a21d9b4552b856fe5832fc2e SHA-1: a9f4591b1096cb8fb376179b7d734b110ed5e778 SHA-256: 8a82cdbf270393aa70fa40aee2b2fbcb404868974ab252ebf0e006946cfc4fd2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous URLs, many of which point to compromised CMS uploads or are part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO poisoning to redirect users to malicious sites. The embedded JavaScript is a common technique for executing malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/epbceb5nsd24dknq5mgul8i680/14068370458.pdf In PDF document text
    • https://adesso-moosburg.de/images/file/ximavebepizasifatitusimam.pdfIn PDF document text
    • https://konyaalotaksi.com/userfiles/file/dusuvudutaxurasuvix.pdfIn PDF document text
    • https://nirkongrp.com/ckfinder/userfiles/files/ralelorixikikotibomireto.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/87040091724.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/84030520493.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/giwekiwurudepavazeb.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/21750711589.pdfIn PDF document text
    • https://fsreloading.com/userfiles/files/94949883424.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/vepabowozezalisurevi.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d7a3c16c9---38361889456.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/37364180297.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109150703177645.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614d766ca51bd---tamuw.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/15663556467.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210904_8E854DE5CC55C7FE.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/7016970583.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/32137223457.pdfIn PDF document text
    • https://rippa.pt/files/file/jafufiwubekasusufe.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/tolipaze.pdfIn PDF document text
    • http://nhasachconggiao.com/luutru/files/8435960610.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/4964679586.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16137120150c3a---rogimizixobuziridero.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137158957515---28398474475.pdfIn PDF document text
    • https://www.wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64204893805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=what+to+do+with+redstone+minecraftPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE174 17516 bytes
SHA-256: c2f405e917528511136dd8ad24020dd05edf90e1380c73b373c17652e1b1dfbd
font_01_sfnt_off00010f07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F07 10772 bytes
SHA-256: f5d2c89e2ddaeb8fa02c954819a477f3747a530ccdc885548f085e17a5456e70
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1